The LENOX Tools Bi-Metal Speed Slot Arbored Hole Saw with T3, 1 '' -25 mm, enhanced tooth geometry that cuts 50 % faster than premature LENOX hole saws. Twice as long-wearing as our premature generation when cutting through golden, this bi-metal hole with a accepted arbor features thicker walls to minimize tooth loss and improve durability. A staircase SPEED SLOT a all-encompassing slot placed small on the hole saw and triple leverage points to make it prosperous to work plugs come out with a screwdriver. This design effectively sawdust and chips and helps prevent plugs from becoming cragfast in the saw. 10 % taller than premature models, it cleaner cuts through two-by lumber.